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6. Which plate contains pore pairs?
- Genital plate
- Interambulacral plate
- Ambulacral plate
- Ocular plate
7. What is the function of 'Aristotle's lantern'?
- To scrape algae or other food towards the gut
- To allow water into the madreporite
- To filter sediment that enters the mouth
- To attach the spine to the boss
8. What is the function of the water vascular system?
- To release sperm and eggs into the water column
- Allows the animals to extend its tube feet by forcing water into the controlled tissues
- To allow fresh water to pass through the animals and dispose of dirty water
9. What is the function of the Labrum?
- To aid respiration and and maintaining the burrow and anal tube
- For spine attachment, allowing them to dig burrows
- A 'lip' protruding over part of the mouth to prevent sediment moving into the mouth
- To direct waste particles to the sanitary tube
10. What is the function of the plastron?
- To respire by gas exchange
- An area of attachment for small spines to dig burrows
- For tube feet attachment for digging
11. What is the function of the Fascioles?
- They prevent sediment entering the test through small holes
- To direct water to the mouth and to direct waste away from the echinoid
- They have no real purpose
- They attach the spine to the boss
12. What is the function of tube feet?
- For defence, support and attachment
- For defence, movement and feeding
- For attachment, movement and respiration
- For respiration, movement and feeding
13. What is the function of the Tubercle?
- For respiration and movement
- For spine attachment
- To allow the tube feet to protrude
14. What is the function of the Genital plate?
- To release sperm and eggs into water column
- To give birth
- To contract and cause the spine to move in a coordinated manner
- To allow echinoids to mate